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Practical Arduino Cool Projects for Open Source Hardware- P45: A schematic or circuit diagram is a diagram that describes the interconnections in an electrical or electronic device. In the projects presented in Practical Arduino, we’ve taken the approach of providing both a photograph and/or line drawing of the completed device along with a schematic. While learning to read schematics takes a modest investment of your time, it will prove useful time and time again as you develop your projects. With that in mind, we present a quick how-to in this section | INDEX introduction to 81 -82 output 81 security systems home 99 power connections 88 tamper detection 85 Security systems tamper detection 84 security automatic sensors basics 84-87 home security system 99 instructions assemble four-channel alarm sensor shield 87-88 90 -92 load test program 95 -98 PIR placement 98 intructions install end-of-line resistors 92 94-95 LEDs 90-92 multiple buttons on one input 99 parts required 82 -83 schemati c 84 sensor resistance 86 -87 shield connections 95 variations 98-99 visual display 98 voltage levels 87 Seeed Studio Ethernet Shield 103 108 semiconductor switches 389 -393 sendWebPage function 229 231 233 sensor outputs common ground connections 89 ser2net 265 ser2net utility 35 serial communications 296 serial connections 311 Serial.available function 287 Serial.print 340 375 Serial.println function 182 375 serialEvent function 129 serproxy utility 35 setup function 46 129 197 199 345 SHIFT key 74 shift register 169 shift registers as inputs 395 as outputs 393-395 SI Prefixes 2 SI Units 2 sinking current 245 smoothing capacitor 244 socket connections 35 SoftSerial Arduino library 116 SoftwareSerial library 151 -152 277 287 297 soldering 14 solid state relays SSRs 389 393 sourcing current 245 SparkFun breakout board 127 SparkFun prototyping shield 90 247 SpeakJet chip 139 142 143 144 See also speech syntheziser allophones 154 157 buffers 147 160 commands 153-154 PWM audio output 144 reading status 160-161 sound effects and tones 157 160 status outputs 145-146 SpeakJet chiup reading status 160 speech output signal 142-143 speech synthesizer 139 161 creating messages 153-154 157 160 instructions 142 audio output 144 beginning assembly 143-144 fit status indicators 145 147 making line-level output cable 148-149 on-board amplifier 149 -151 quick test 145 speech output signal 142-143 parts required 140-141 schematic 14 1 software 151 -153 variations 160-161 SPI Serial Peripheral Interface 324 419 INDEX SPO256A-AL2 Allophone Speech .
